Hi,
I have a question upon some netlink api's.
What I want is to create a small packet in kernel space, then send it to userland where a program is listening and display's what it received.
Upon initializing I open up a socket:
#define NETLINK_TEST 17
DEFINE_MUTEX(mutex);
static struct sock * nl_sk = NULL;
void nl_input( struct sk_buff * skb)
{
mutex_lock(&mutex);
netlink_rcv_skb(skb, &knetlink_process);
mutex_unlock(&mutex);
}
int nlmodule_init( void ) {
nl_sk = netlink_kernel_create(&init_net, NETLINK_TEST, nl_input, NULL, THIS_MODULE);
if ( nl_sk == NULL ) {
printk(KERN_INFO "netlink module initialization failed\n");
return 1;
}
prinkt(KERN_INFO "Netlink socket created\n");
return 0;
}
void nlmodule_exit( void )
{
if ( nl_sk != NULL ) {
sock_release( nl_sk->sk_socket );
} else {
printk("The socket is already NULL for some reason, don't release it\n");
}
}
module_init( nlmodule_init );
module_exit( nlmodule_exit );
MODULE_LICENSE("GPL");
The initialization seems to go well, even though I do not give an skb as argument when calling nl_input.
So a socket is being created, that is, when I add a printk(KERN_INFO "pointer to socket: %p\n", (void*)knetlink_sk); I see a value, hence it must have succeeded. Am I doing anything wrong here?
This is not exactly what I want, because i just want to create a small packet and send it to the userland process listing. But I do need an input function like nl_input, otherwise I cannot create a socket.
Any advice on this one?
Thanks,
Reinoud.
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